<html>
<head>
<meta charset="UTF-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
const { useState } = React
function App() {
const [inputValue, setInputValue] = useState('');
const handleInputChange = (e) => {
const value = e.target.value;
// Allow only positive numbers
if (/^[0-9]*$/.test(value)) {
setInputValue(value);
}
};
return (
<div className='container'>
<h3>React Js Input field Allow only Positive Number</h3>
<input
type="text"
value={inputValue}
onChange={handleInputChange}
placeholder="Enter a positive number"
/>
</div>
);
}
ReactDOM.render(<App />, document.getElementById("app"));
</script>
<style>
* {
box-sizing: border-box;
}
body {
font-family: Arial, sans-serif;
margin: 0;
padding: 0;
}
.container {
margin: 0 auto;
width: 600px;
text-align: center;
box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
padding: 20px;
}
h3 {
margin-bottom: 20px;
}
input {
padding: 10px;
margin-bottom: 10px;
border-radius: 5px;
border: 1px solid #ccc;
transition: border-color 0.3s ease;
}
input:focus {
outline: none;
border-color: #007bff;
}
</style>
</body>
</html>